Add ILVerify option to validate all metadata references

[pkuyo]

Fixes #96458

Adds an opt-in --verify-all-dependencies option to ILVerify.

With this option enabled, ILVerify performs an additional pass over supported metadata references, resolving each one independently so that all failures are reported. (The pass skips P/Invoke ModuleRefs, since they name native libraries rather than managed netmodules.)

Diagnostics use the most specific available error identifier and include metadata tokens when --tokens is specified.
For example, running with both options produces output like this:

[MD]: Error [FileLoadErrorGeneric]: [X.dll][token 0x23000002] Unable to resolve metadata reference (AssemblyReference): Failed to load assembly 'ILVerifyAssemblyThatDoesNotExist'
[MD]: Error [TokenResolve]: [X.dll][token 0x1A000001] Unable to resolve metadata reference (ModuleReference): Assembly or module not found: ILVerifyManagedModuleThatDoesNotExist.netmodule
[MD]: Error [FileLoadErrorGeneric]: [X.dll][token 0x27000001] Unable to resolve metadata reference (ExportedType): Failed to load assembly 'ILVerifyAssemblyThatDoesNotExist'

Tests cover all supported reference kinds, including unused invalid references and valid assembly, type, and managed netmodule references.

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